I was not sure if this is what I needed at first, but when it came in the mail I was more than pleased.
I used the rails when building a table for my sound board.
The only thing that would make this better would be to have the dimensions for a rack with the shipment or on this site. I did a lot of Internet searching and a little trial and error to get the rails at the correct distance.

My overall experience with MCM was great! Not only did they have the mother board I was looking for, they also where about 50% cheaper than Sears. Shipping was fast and reasonable and the customer service was very polite and helpful. I will definitely come back to MCM.